EP3475591A1 - Synthetic resin retainer for large thrust ball bearings with dry-lubricant and wet-lubricant management systems - Google Patents
Synthetic resin retainer for large thrust ball bearings with dry-lubricant and wet-lubricant management systemsInfo
- Publication number
- EP3475591A1 EP3475591A1 EP17734586.5A EP17734586A EP3475591A1 EP 3475591 A1 EP3475591 A1 EP 3475591A1 EP 17734586 A EP17734586 A EP 17734586A EP 3475591 A1 EP3475591 A1 EP 3475591A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- retainer
- ball
- segments
- ball bearing
- assembly according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 8
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 8
- 239000000314 lubricant Substances 0.000 title claims description 29
- 239000000463 material Substances 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 11
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 5
- 239000004917 carbon fiber Substances 0.000 claims abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 10
- 230000007613 environmental effect Effects 0.000 claims description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 239000002199 base oil Substances 0.000 claims description 4
- 150000001940 cyclopentanes Chemical class 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920002312 polyamide-imide Polymers 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000004962 Polyamide-imide Substances 0.000 claims description 2
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 claims description 2
- 229920000620 organic polymer Polymers 0.000 claims description 2
- 239000003566 sealing material Substances 0.000 claims 1
- 238000007743 anodising Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000005461 lubrication Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 101000606535 Homo sapiens Receptor-type tyrosine-protein phosphatase epsilon Proteins 0.000 abstract 1
- 102100039665 Receptor-type tyrosine-protein phosphatase epsilon Human genes 0.000 abstract 1
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 239000010687 lubricating oil Substances 0.000 description 16
- 238000005096 rolling process Methods 0.000 description 11
- 230000007246 mechanism Effects 0.000 description 6
- 238000009713 electroplating Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002052 molecular layer Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/10—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/3806—Details of interaction of cage and race, e.g. retention, centring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/3818—Ball cages formed of unconnected segments
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/3887—Details of individual pockets, e.g. shape or ball retaining means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/44—Selection of substances
- F16C33/445—Coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6622—Details of supply and/or removal of the grease, e.g. purging grease
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/664—Retaining the liquid in or near the bearing
- F16C33/6651—Retaining the liquid in or near the bearing in recesses or cavities provided in retainers, races or rolling elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6688—Lubricant compositions or properties, e.g. viscosity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6696—Special parts or details in view of lubrication with solids as lubricant, e.g. dry coatings, powder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
- F16C2208/04—Glass fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/30—Fluoropolymers
- F16C2208/32—Polytetrafluorethylene [PTFE]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/30—Coating surfaces
- F16C2223/70—Coating surfaces by electroplating or electrolytic coating, e.g. anodising, galvanising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/10—Application independent of particular apparatuses related to size
- F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- This invention is related to ball bearings in general and, more particularly, to ball bearing retainers (also known as separators or cages) and a lubrication management system for large thrust ball bearings and to an integrated angular contact thrust bearing system.
- ball bearing retainers also known as separators or cages
- lubrication management system for large thrust ball bearings and to an integrated angular contact thrust bearing system.
- a conventional ball bearing assembly typically contains four basic components comprising an outer or top ring, an inner or bottom ring, a ball retainer (separators or cages) sandwiched between the two rings, rolling elements or ball bearings held by the ball retainer and a lubricant.
- the ball retainer and its contained rolling elements bearings form a ball bearing-retainer or bearing assembly.
- the bearing assembly has its rolling elements circumferentially spaced apart from one another and between the two rings. Thus, the retainer maintains the circumferential spacing between adjacent roller elements.
- the retainer is typically a single piece part having cylindrical holes or pockets to hold the ball bearings.
- a conventional thrust ball bearing retainer is formed as a solid single-piece component and ordinarily provides a satisfactory means for retaining spacing rolling elements around the bearing raceways for small and medium sized bearings, such as having a pitch diameter which is less than 6".
- large thrust ball bearings become very expensive to make or even become un-producible resulting from such distortions as excessive out-of-round, out-of-flatness, and torsional wrap.
- solid, single-piece retainers become a limiting factor due to thermal induced binding resulting from a coefficient of thermal expansion mismatch between the retainer and raceway materials.
- conventional thrust ball bearing retainers are designed for use with liquid lubricants and may not work at all when liquid lubricants are not applicable or otherwise not to be used. This results in limiting their use in applications where liquid lubricants are not applicable, such as where the ambient cold operating temperature is less than the pour point temperature of any liquid lubricant or where the ambient hot operating temperature exceeds the flash point temperature of any liquid lubricant or where the running torque excursions due to temperature levels do not meet a particular system capability or performance.
- the thrust ball bearing comprises an outer or top and inner or bottom rings, a plurality of rolling elements, which are mounted between the rings, and a retainer for retaining circumferentially spaced rolling elements apart from one another.
- the different configuration includes the following improvements.
- the retainer is segmented into multiple circular arc pieces in which each piece holds a given number of balls. The number of retainer segments is selected accordingly in order to reduce thermal induced effects on torque, sliding friction torque and dynamics induced effects between the retainer segments and other bearing components (i.e., ball, bearing rings, etc.).
- the retainer ends of the segments are rounded to minimize the radially transferring forces and the retainer wear between two adjacent segments.
- the retainer segments are designed to have a guided feature on the inner or bottom raceway shoulders.
- This double inner or bottom raceway shoulder guided feature minimizes the retainer dynamic instability and the pocket wear due to a much lower retainer/inner raceway relative velocity as compared with the conventional ball guided retainer or double outer and inner raceway shoulder guided retainer.
- this feature also avoids excessive solid lubricant transferred from retainer pockets to balls and subsequently to raceway track/ball interfaces. Thus, excessive high torque noise is avoided due to deposited solid lubricant on raceway/ball interfaces.
- the single raceway shoulder guided feature from the retainer also prevent brake action when the retainer segments contact the shoulders of both lower upper raceways.
- the retainer pocket is circular and the pocket/ball clearance is selected to account for the part tolerance and the thermal induced dimensional change in order to prevent the ball/retainer interference.
- the retainer ball pocket is selected to have an oval cross section with the major axis along the circumferential direction.
- a solid lubricant mechanism is applied as follows: (a) the bearing ring internal surfaces are modified for optimal friction and wear by an electroplating process.
- the anodizing thickness is selected to prevent case crushing under Hertzian contact stress between the ball and the raceway; (b) electroplated surfaces are covered with a molecular layer of per-fluorinated polyether based fluid; (c) a lubrication resupply mechanism is derived from the use of a double transfer film applied from the bearing retainer pockets to the balls and from the balls to the raceway tracks. Retainer materials are selected as a lubricant resupply reservoir and provides the needed lubricant to all bearing component interfaces through kinematic contacts; (d) the proper amount of lubricant resupply is controlled by retainer material, interface clearances, environmental operating conditions and bearing kinematic relationship between the bearing components.
- a liquid lubricant mechanism is applied as follows: (a) to provide the initial wear protection, bearing ring internal surfaces are modified for optimal friction and wear by electroplating process; (b) synthetic hydrocarbon base oils provide good lubricity and low wear in a slow-to-moderate speed application as this thrust ball bearings. Greases or oils can be used.
- lubricants depends on allowable resistance bearing torque, operating temperature, speed, and torque noise; (c) retainer material is a molded, synthetic resin with added fillers to increase strength and to reduce wear rate, (d) the proper amount of lubricant resupply is controlled by retainer material, interface clearances, environmental operating conditions and bearing kinematic relationship between the bearing components.
- FIG. 1 is an isometric view of a conventional or prior art thrust ball bearing assembly.
- FIG. 1A is a cross-section taken along line 1A-1A of FIG. 1.
- FIG. 2 is an isometric view of the conventional, single-piece, thrust ball bearing retainer and its contained ball bearings as shown in the FIG. 1 assembly.
- FIG. 3 is an isometric view of a section of the conventional thrust ball bearing retainer with cylindrical pockets of the thrust ball bearing assembly as illustrated in
- FIG. 4 is an isometric exploded view of a preferred embodiment of the present invention comprising a thrust ball bearing assembly in which its ball bearing retainer has individual thrust ball bearing pockets with wedges for supporting the several ball bearings.
- FIG. 5 is an exploded view of the embodiment shown in FIG. 4 taken along cross-section line 5-5 thereof.
- FIG. 6 is a cross-sectional view of the assembled embodiment illustrated in FIGS. 4 and 5 depicting its wedge-shaped thrust ball bearing pocket in the retainer.
- FIG. 7 is an enlarged cross-sectional view of a portion of the thrust ball bearing retainer taken along the circular line denoted "7" in FIG. 6 to better shown the wedge- shaped thrust ball bearing pocket in the retainer.
- FIG. 8 is a further enlarged cross-sectional view of a single thrust ball bearing retainer pocket with a ball bearing supported therein to best show the wedge-shaped thrust ball bearing support in the retainer.
- FIG. 9 is a top view of a first embodiment of a segment of the retainer employable in the thrust ball bearing assembly as shown in FIG. 4 in which the thrust ball bearing retainer has circular pockets for the ball bearings..
- FIG. 9A is a view of the retainer circular pocket of FIG. 9.
- FIG. 10 is an isometric view of a second embodiment of a segment of the retainer employable in the thrust ball bearing assembly as shown in FIG. 4 in which the thrust ball bearing retainer has alternatively slotted ball pockets.
- FIG. 1 1 is an isometric view of a third embodiment of a segment of the retainer employable in the thrust ball bearing assembly as shown in FIG. 4 in which the thrust ball bearing retainer has oval pockets for the ball bearings.
- FIG. 1 1 A is a view of the retainer oval pocket of FIG. 1 1.
- FIG. 12 is a cross-section taken along lines 12-12 of FIGS. 9-1 1 depicting the rounded ends having radii and R 2 terminating their respective retainer segments.
- a conventional ball bearing assembly typically contains four basic components as depicted in FIGS. 1 -3.
- Such a prior art assembly denoted by indicium 20, comprises an outer or top ring 22, an inner or bottom ring 24, a ball retainer 26 (sometimes termed separator or cage) sandwiched between rings 22 and 24, rolling elements or ball bearings 28 held by the ball retainer.
- a lubricant (not shown) is often included.
- Ball retainer 26 and its contained rolling elements bearings 28 form an assembly 30 as best seen in FIG. 2.
- Each ring 22 and 24 include a race 32 as best shown in FIG. 1A for ball-bearings 28.
- Bearing assembly 30 has its rolling elements 28 circumferentially spaced apart from one another and between outer or top ring 22 and inner or bottom ring 24.
- retainer 26 maintains the circumferential spacing between adjacent roller elements 28.
- the retainer is typically a single piece part with cylindrical holes or pockets 34.
- a conventional thrust ball bearing retainer such as retainer 26, which is formed as a solid, single-piece component, ordinarily provides a satisfactory means for retaining spacing rolling elements 28 around the bearing raceways for small and medium sized bearings, such as those having a pitch diameter which is less than 6".
- a large thrust ball bearing becomes very expensive to manufacture or even becomes un-producible due to excessive out-of-round, out-of-flatness, and torsional wrap.
- solid, single-piece retainers become a limiting factor due to thermally induced binding resulting from a coefficient of thermal expansion mismatch between their retainer and raceway materials.
- a thrust ball bearing assembly 40 comprises an outer or top ring 42, an inner or bottom ring 44, a retainer 46, and a plurality of rolling elements or ball bearings 48 retained within and spaced apart from one another by the retainer. Elements 48 are thereby mounted between outer or top ring 42 and inner or bottom ring 44. The combination of the ball bearings and the retainer forms a bearing- retainer assembly 50.
- Retainer 46 is generalized in FIGS. 4 and 5 as a representation which is configured into specific formulations as depicted in subsequent figures.
- Rings 42 and 44 each are provided with bearing ring internal races or raceways 52 bounded by raceway shoulders 54a and 54b.
- Ball bearings 48 are disposed to be seated within the raceways and to roll therewithin.
- retainer 46 includes pockets 56 having openings 58 for reception of individual ball bearings.
- Each opening 58 has rounded parallel sides (e.g., circularly or ovally shaped as depicted and described hereinafter) to enable its ball bearing to be inserted into its pocket 56 and each parallel sided opening 58 terminates in a rounded wedge- shaped seat 60.
- the retainer is bounded with upper and lower surfaces 62a and 62b.
- Upper surface 62a is spaced from raceway shoulder 54a of top ring 42.
- Lower surface 62b is disposed to rest upon raceway shoulder 54b of lower ring 44.
- the retainer is segmented into multiple circular arc pieces or segments 146, 246 and 346, as illustrated respectively in FIGS. 9, 10, and 1 1.
- Each piece is designed to hold a certain number of balls.
- the number of retainer segments is selected in consonance with those needs such as will reduce thermal induced effects on torque, sliding friction torque and dynamics induced effects between the retainer segments and other bearing components including, but not limited to, such components as balls and bearing rings.
- segments 146, 246 and 346 respectively include pockets 156, 256 and 356, openings 158, 258 and 358, wedge-shaped seats 160, 260 and 360.
- FIGS. 9 and 9A illustrate pockets with a circular cross-section. Pockets 258 in FIG. 10, in addition to pockets also having a circular cross-section, are slotted with slots 262.
- Pockets 356 in FIGS. 1 1 and 1 A have an oval configuration; such a modification is described below.
- segments 154, 254 and 354 are each terminated with similar rounded retainer ends 64 (see FIG. 12) each having two radii 64a and 64b with respective radii dimensions, and R 2 , to minimize radially transferring forces and retainer wear between adjacent segments.
- the several retainer segments are designed to have the guided feature on the inner or bottom raceway shoulders 54b.
- This double inner or bottom raceway shoulder 54b guided feature minimizes the retainer dynamic instability and the pocket wear due to much lower retainer/inner raceway relative velocity as compared to the conventional ball guided retainer.
- this feature also avoids excessive solid lubricant transferred from retainer pockets to ball bearings and subsequently to raceway track/ball interfaces, thereby avoiding the deposit of excessive solid lubricant on raceway/ball interfaces that otherwise cause high torque noise.
- the single raceway shoulder guided feature from the retainer also prevent brake action when the retainer segments contact both shoulders on the lower and upper raceways.
- the retainer pocket is rounded (circular or otherwise) and the pocket/ball clearance is selected to account for the part tolerance and the thermal induced dimensional change in order to prevent the ball/retainer interference.
- the retainer ball pocket is selected to have an oval cross section with the major axis along the circumferential direction.
- T hot extreme operating hot temperature
- T co!d extreme operating cold temperature
- detainer thermal coefficient of expansion for ball retainer material along the circumferential direction, 1/°C
- araceway thermal coefficient of expansion for raceway material
- 1/°C tol pocket diametral manufacturing tolerance
- bearing ring internal surfaces 52 are modified for optimal friction and wear by an electroplating process.
- bearing rings are made of structural aluminum such as 6061 -T6 or 7075-T6, a hard anodizing coating, type 3, with polytetrafluoroethylene (PTFE) sealing is applied.
- the anodizing thickness is selected to prevent case crushing under Hertzian contact stress between the ball and the raceway.
- electroplating surfaces 52 are covered with a molecular layer of per-fluorinated polyether based fluid such as Castrol Brayco 815z.
- Lubrication resupply mechanism comes from the double transfer film from bearing retainer pockets to balls and from balls to raceway tracks.
- Retainer materials are selected as a lubricant resupply reservoir and to provide the needed lubricant to all bearing component interfaces through kinematic contacts.
- a retainer material can be molded, synthetic resin, self-lubricated material reinforced with carbon fiber, molybdenum disulfide, and polytetrafluoroethylene (PTFE).
- a liquid lubricant mechanism is applied as follows:
- bearing ring internal surfaces 52 are modified for optimal friction and wear by anelectroplating process.
- bearing rings 42 and 44 are made of structural aluminum such as 6061 -T6 or 7075-T6, a hard anodizing coating, type 3, with an organic polymer, such as polytetrafluoroethylene (PTFE), sealing is applied.
- PTFE polytetrafluoroethylene
- synthetic hydrocarbon base oils such as polyalphaolephines (PAO) or multiply-alkylated cyclopentanes (MACs Multiply-Alkylated Cyclopentanes) with wear protection additives such as lead napthenate or tricresyl phosphate show good lubricity and low wear in a slow-to-moderate speed application as this thrust ball bearings.
- Greases or oils can be used. The proper choice of these forms of lubricants depends on allowable resistance bearing torque, operating temperature, speed, and torque noise.
- Retainer material is a molded, synthetic resin such as polyamide (PA) or polyetherether ketone (PEEK) or polyamide-imide PAI with added fillers such as glass fiber or carbon fiber to increase strength and to reduce wear rate.
- PA polyamide
- PEEK polyetherether ketone
- PAI polyamide-imide PAI with added fillers such as glass fiber or carbon fiber to increase strength and to reduce wear rate.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/193,077 US10054156B2 (en) | 2016-06-26 | 2016-06-26 | Synthetic resin retainer for large thrust ball bearings with dry-lubricant and wet-lubricant management systems |
PCT/US2017/038058 WO2018005138A1 (en) | 2016-06-26 | 2017-06-18 | Synthetic resin retainer for large thrust ball bearings with dry-lubricant and wet-lubricant management systems |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3475591A1 true EP3475591A1 (en) | 2019-05-01 |
EP3475591B1 EP3475591B1 (en) | 2021-04-14 |
Family
ID=59258381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17734586.5A Active EP3475591B1 (en) | 2016-06-26 | 2017-06-18 | Synthetic resin retainer for large thrust ball bearings with dry-lubricant and wet-lubricant management systems |
Country Status (3)
Country | Link |
---|---|
US (1) | US10054156B2 (en) |
EP (1) | EP3475591B1 (en) |
WO (1) | WO2018005138A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202018102121U1 (en) | 2018-04-17 | 2019-07-19 | Liebherr-Components Biberach Gmbh | slewing bearings |
CN112013030B (en) * | 2020-08-20 | 2022-02-08 | 杭州康丰机械设备有限公司 | Industrial anti-skid bearing |
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- 2017-06-18 WO PCT/US2017/038058 patent/WO2018005138A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
US20170370406A1 (en) | 2017-12-28 |
US10054156B2 (en) | 2018-08-21 |
EP3475591B1 (en) | 2021-04-14 |
WO2018005138A1 (en) | 2018-01-04 |
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